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[build] Fix signed/unsigned division in util/zbin.c

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Commit b149a99 ([build] Round up SUBx deltas) introduced a
signed/unsigned issue that affects gPXE images built on 32-bit hosts.
The zbin fixup utility performed an unsigned division, which led to
.usb images with an incorrect number of sectors to load.

The issue snuck by on 64-bit hosts since uint32_t is promoted to long.
On 32-bit hosts it is promoted to unsigned long.

Modified-by: Michael Brown <mcb30@etherboot.org>
Signed-off-by: Michael Brown <mcb30@etherboot.org>
This commit is contained in:
Stefan Hajnoczi 2009-04-24 10:21:07 +01:00 committed by Michael Brown
parent 4b8e021161
commit 9b964dec36
1 changed files with 5 additions and 4 deletions
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9
src/util/zbin.c
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@ -213,7 +213,8 @@ static int process_zinfo_subtract ( struct input_file *input,
size_t datasize ) {
size_t offset = subtract->offset;
void *target;
long delta;
signed long raw_delta;
signed long delta;
unsigned long old;
unsigned long new;
@ -224,9 +225,9 @@ static int process_zinfo_subtract ( struct input_file *input,
}
target = ( output->buf + offset );
delta = ( ( align ( output->len, subtract->divisor ) -
align ( input->len, subtract->divisor ) )
/ subtract->divisor );
raw_delta = ( align ( output->len, subtract->divisor ) -
align ( input->len, subtract->divisor ) );
delta = ( raw_delta / ( ( signed long ) subtract->divisor ) );
switch ( datasize ) {
case 1: {